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    • 7. 发明申请
    • SYSTEM AND METHOD OF SPECTRAL CALIBRATION AND BASIS MATERIAL DECOMPOSITION FOR X-RAY CT SYSTEMS
    • X射线CT系统的光谱校准和基础材料分解系统与方法
    • US20120069952A1
    • 2012-03-22
    • US12883631
    • 2010-09-16
    • Xiaoye WuDan XuNaveen ChandraZhanyu GeJiang HsiehDaniel David HarrisonMary Sue Kulpins
    • Xiaoye WuDan XuNaveen ChandraZhanyu GeJiang HsiehDaniel David HarrisonMary Sue Kulpins
    • A61B6/03
    • A61B6/583A61B6/032A61B6/482A61B6/585
    • An imaging system includes an x-ray source that emits a beam of x-rays toward an object, a detector that receives high frequency electromagnetic energy attenuated by the object, a data acquisition system (DAS) operably connected to the detector, and a computer operably connected to the DAS. The computer is programmed to compute detector coefficients based on a static low kVp measurement and a static high kVp measurement, capture incident spectra at high and low kVp during fast kVp switching, compute effective X-ray incident spectra at high and low kVp during fast kVp switching using the captured incident spectra, scan a water phantom and normalize the computed detector coefficients to water, adjust the computed effective X-ray incident spectra based on the normalized detector coefficients, compute basis material decomposition functions using the adjusted X-ray incident spectra, and generate one or more basis material density images using the computed basis material decomposition functions.
    • 成像系统包括:x射线源,其朝向物体发射X射线束;接收被物体衰减的高频电磁能的检测器;可操作地连接到检测器的数据采集系统(DAS);以及计算机 可操作地连接到DAS。 计算机被编程为基于静态低kVp测量和静态高kVp测量来计算检测器系数,在快速kVp切换期间在高和低kVp处捕获入射光谱,在快速kVp期间计算高和低kVp处的有效X射线入射光谱 使用捕获的入射光谱切换,扫描水体模型并将计算的检测器系数归一化为水,基于归一化的检测器系数调整计算的有效X射线入射光谱,使用调整的X射线入射光谱计算基础材料分解函数, 并使用所计算的基础材料分解函数生成一个或多个基础材料密度图像。
    • 8. 发明授权
    • System and method of data interpolation in fast kVp switching dual energy CT
    • 快速kVp开关双能CT数据插值系统与方法
    • US07995702B2
    • 2011-08-09
    • US12547117
    • 2009-08-25
    • Dan XuDavid Allen LanganXiaoye Wu
    • Dan XuDavid Allen LanganXiaoye Wu
    • A61B6/00
    • G01N23/046A61B6/027G01N2223/419G01N2223/612G06T11/005G06T2211/408
    • A CT system includes a rotatable gantry having an opening for receiving an object to be scanned, an x-ray source coupled to the gantry and configured to project x-rays through the opening, a generator configured to energize the x-ray source to a first kVp and to a second kVp to generate the x-rays, and a detector having pixels therein, the detector attached to the gantry and positioned to receive the x-rays. The system includes a computer programmed to acquire a first view dataset and a second view dataset with the x-ray source energized to the first kVp, interpolate the first and second view datasets to generate interpolated pixels in an interpolated view dataset at the first kVp, using at least two pixels from each of the first and second view datasets to generate each interpolated pixel in the interpolated view dataset, and generate an image of the object using the interpolated view dataset.
    • CT系统包括可旋转机架,其具有用于接收待扫描物体的开口,耦合到台架的X射线源,并且被配置成将X射线投射穿过开口;发生器,被配置为将x射线源激励到 第一kVp和第二kVp以产生x射线,以及其中具有像素的检测器,所述检测器附接到台架并定位成接收x射线。 该系统包括被编程为获取第一视图数据集的计算机和具有激励到第一kVp的x射线源的第二视图数据集,内插第一和第二视图数据集以在第一kVp的内插视图数据集中生成内插像素, 使用来自第一和第二视图数据集中的每一个的至少两个像素来生成内插视图数据集中的每个内插像素,并且使用内插视图数据集生成对象的图像。
    • 9. 发明申请
    • SYSTEM AND METHOD OF DATA INTERPOLATION IN FAST KVP SWITCHING DUAL ENERGY CT
    • 快速KVP切换双能量CT数据插值系统与方法
    • US20110052022A1
    • 2011-03-03
    • US12547117
    • 2009-08-25
    • Dan XuDavid Allen LanganXiaoye Wu
    • Dan XuDavid Allen LanganXiaoye Wu
    • G06K9/00G01N23/00
    • G01N23/046A61B6/027G01N2223/419G01N2223/612G06T11/005G06T2211/408
    • A CT system includes a rotatable gantry having an opening for receiving an object to be scanned, an x-ray source coupled to the gantry and configured to project x-rays through the opening, a generator configured to energize the x-ray source to a first kVp and to a second kVp to generate the x-rays, and a detector having pixels therein, the detector attached to the gantry and positioned to receive the x-rays. The system includes a computer programmed to acquire a first view dataset and a second view dataset with the x-ray source energized to the first kVp, interpolate the first and second view datasets to generate interpolated pixels in an interpolated view dataset at the first kVp, using at least two pixels from each of the first and second view datasets to generate each interpolated pixel in the interpolated view dataset, and generate an image of the object using the interpolated view dataset.
    • CT系统包括可旋转机架,其具有用于接收待扫描物体的开口,耦合到台架的X射线源,并且被配置成将X射线投射穿过开口;发生器,被配置为将x射线源激励到 第一kVp和第二kVp以产生x射线,以及其中具有像素的检测器,所述检测器附接到台架并定位成接收x射线。 该系统包括被编程为获取第一视图数据集的计算机和具有激励到第一kVp的x射线源的第二视图数据集,内插第一和第二视图数据集以在第一kVp的内插视图数据集中生成内插像素, 使用来自第一和第二视图数据集中的每一个的至少两个像素来生成内插视图数据集中的每个内插像素,并且使用内插视图数据集生成对象的图像。
    • 10. 发明申请
    • Wireless Terminal, Base Station and Channel Characteristic Estimating Method
    • 无线终端,基站和信道特征估计方法
    • US20100046359A1
    • 2010-02-25
    • US12493338
    • 2009-06-29
    • Dan XuMikio KuwaharaYuji IshidaMasanori Taira
    • Dan XuMikio KuwaharaYuji IshidaMasanori Taira
    • H04J11/00H04J3/06
    • H04L25/0234H04L25/022H04L27/2662
    • In a wireless communication system based on an OFDM access system, when forgetting averaging channel estimation is performed, there occurs a phase difference between a present channel estimated value and a past estimated value due to a change of FFT operation timing at a reception side. The error of the channel estimated value caused by the phase difference is corrected. A synchronization catching/tracking unit to determine an operation timing of an FFT from a received signal is provided, and an FFT operation timing difference acquisition section to grasp a change of the operation timing of the FFT generated by the synchronization catching/tracking unit is provided. Based on an FFT operation timing change amount as an output of the FFT operation timing difference acquisition section, a rotation operation is performed on a propagation path estimated result stored in a channel estimation section to estimate a propagation path from a received pilot signal, so that the error of the channel estimated value is corrected.
    • 在基于OFDM接入系统的无线通信系统中,当进行平均信道估计的遗忘时,由于接收侧的FFT运算定时的变化,存在当前信道估计值与过去估计值之间的相位差。 校正由相位差引起的信道估计值的误差。 提供了一种用于从接收信号确定FFT的操作定时的同步捕获/跟踪单元,并且提供了用于掌握由同步捕获/跟踪单元生成的FFT的操作定时的改变的FFT操作定时差异获取部 。 基于作为FFT运算定时差分获取部的输出的FFT运算定时变更量,对存储在信道估计部中的传播路径推定结果进行旋转运算,从接收到的导频信号估计传播路径, 校正信道估计值的误差。